Hello HandSpa,
Thanks for reaching out through the Apple Support Communities about the times being off with your calendar events.
Is the time zone set correctly on your iPhone? Change the date and time on iPhone
Do you have the Calendar app set up to sync with multiple accounts? Set up multiple calendars on iPhone If so, is this happening with events for all your accounts?
Do you sync your calendar with any other devices? If so, are they exhibiting the same behavior?
Additionally, is your iPhone all up to date? Update your iPhone, iPad, or iPod touch
Hopefully those details will help to isolate this behavior further.
Take care.